Keystones — Capstone
Five GCSE retrieval questions · 7 December 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 78°
Answer: 120.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 90, 80, 85, 53, 99, 51
Answer: Mean = 72.9, Median = 80, Range = 48